During the cold war Era (1945-1990),why were the United States and the soviet Union reluctant/hesitant to become inolved in direct military conflict?

What kind of relationship did the soviet union have with the united states in 1945

Why did reagan have the united stars invade grenada

Is the weather changing? consider the data of severe weather that includes tornadoes occurring throughout the u. s. over the last four years. compare the severe weather for the last three years. then compare the first three months of 2017 with that data. based on previous years, what might the prediction be for weather during 2017?